[MlMt] Turn off default BCC preference

[David Green]

On 19 May 2020, at 18:42, Evan Silberman wrote:

> I sent the default BCC secret preference.
>
> defaults write com.freron.MailMate MmDefaultBccHeader -string 
> me at example.com
>
> How do I turn this off?

I think

defaults delete com.freron.MailMate MmDefaultBccHeader

Will do the trick.

Dave